Percentage of observations where the VFR minimums for ceiling and visibility are met: visibility of 5 mi or more and a ceiling of 3,000 ft or more. Only observations between sunrise and sunset are taken into account.
Marginal VFR conditions (%)
Month
Average
2024
2023
2022
2021
2020
January
67.2
94
0
88
0
February
66.5
48
46
73
57
80
March
79.9
75
64
87
70
89
April
89.5
81
92
93
87
86
May
91.4
90
84
100
98
June
91.1
89
94
91
July
83.0
78
87
87
August
80.7
80
71
89
September
87.1
84
85
94
96
October
85.5
95
81
86
86
November
79.2
83
64
98
88
December
64.2
73
37
53
78
Average
82.4
71.7
76.8
81.5
82.4
89.7
Marginal VFR conditions or better during daylight period
Percentage of observations where the MVFR minimums for ceiling and visibility are met: visibility of 3⅛ mi or more and a ceiling of 1,000 ft or more. Only observations between sunrise and sunset are taken into account.
Maximum temperatures (°C)
Month
Average
2024
2023
2022
2021
2020
January
-8.6
-18
0
-10
-13
February
-6.8
-4
-6
-9
-8
-10
March
-3.3
-4
-2
-1
-5
-5
April
3.8
3
-1
5
3
4
May
12.4
10
13
9
15
June
18.1
16
20
16
July
18.0
17
17
17
August
16.2
16
15
18
September
10.9
10
11
9
11
October
4.4
4
4
3
6
November
-4.5
-1
-2
-11
-1
December
-6.0
-11
0
-5
-7
Average
2.9
-4.7
4.1
5.5
-2.2
6.9
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
2021
2020
January
-13.2
-25
0
-18
-13
February
-12.4
-9
-14
-14
-14
-18
March
-12.9
-12
-12
-9
-15
-12
April
-6.9
-5
-14
-4
-6
-3
May
1.7
1
0
-1
3
June
6.9
7
7
6
July
9.4
10
9
9
August
8.2
10
8
8
September
3.7
3
5
0
3
October
-2.1
-3
-3
-3
-1
November
-10.1
-7
-9
-20
-7
December
-13.9
-18
-5
-12
-14
Average
-5.3
-10.0
-4.7
-3.4
-10.2
-2.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
17.2
12
0
22
0
February
33.1
34
43
45
52
7
March
26.9
39
46
18
36
17
April
17.7
24
18
11
15
24
May
14.9
28
8
0
7
June
8.1
16
5
9
July
17.7
32
21
7
August
19.1
27
26
5
September
21.4
23
29
17
10
October
17.1
10
17
19
13
November
27.3
37
35
10
20
December
34.9
41
27
44
36
Average
20.9
31.2
26.7
20.2
22.6
12.3
Precipitation during daylight period
Percentage of observations with observed rain, drizzle, snow or hail. Only observations between sunrise and sunset are taken into account.
Wind speed (knots)
Month
Average
2024
2023
2022
2021
2020
January
10.0
8
0
14
0
February
12.7
9
10
16
10
17
March
11.5
13
13
14
11
10
April
10.0
10
8
11
12
10
May
7.5
9
8
10
8
June
7.1
9
7
6
July
7.0
7
8
6
August
7.7
9
8
6
September
8.9
7
9
9
10
October
8.9
8
8
9
9
November
10.4
11
12
6
11
December
10.8
8
8
13
12
Average
9.7
10.7
8.5
9.7
9.9
8.2
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
2021
2020
January
065°
360°
045°
360°
February
103°
090°
061°
066°
047°
March
096°
104°
048°
100°
095°
April
140°
011°
085°
057°
066°
May
067°
238°
061°
078°
June
080°
077°
161°
July
114°
117°
218°
August
121°
167°
047°
September
162°
096°
044°
072°
October
013°
045°
060°
079°
November
076°
015°
030°
082°
December
063°
096°
153°
056°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.